QUETTA: Four Frontier Constabulary personnel were martyred and three other suffered injuries in an explosion near a security vehicle in Quetta’s Margate area, police said on Friday. Faced with increasing attacks by militants, especially in Khyber Pakhtunkhwa and Balochistan, security forces have also intensified counterterrorism operations. Hanna Urak Station House Officer Naveed Akhtar told Dawn.com that the bomb disposal squad …